Today I noticed that the default app for mkvs had changed to VLC, and there was no option at all for QuickTime (which is weird because there's usually an option even without Perian installed, it just shows an error message). I managed to open an mkv in QT, but it gave me said error message. I played mkvs in QuickTime yesterday, haven't installed/updated anything in a while, and Perian is installed.

Anyone know what the problem is? All help is appreciated.

(Also, I don't want to use VLC because I prefer using QuickTime to gif videos.)